I've found a workaround and a "fix" for this problem, but the ImageMagick developers would have to judge if it is a real fix.
The workaround is to specify explicitly the option
-alpha off
on the commandline for convert. For example
convert -alpha off +antialias -density 120 -rotate 270 test.eps test.png
The "fix" is to modify the file delegates.xml and to change the DEVICE option for the ps:alpha type from pngalpha to pnmraw. The behaviour then seems to be "as it used to" again. It is unclear if this has further side effects.
I've found a workaround and a "fix" for this problem, but the ImageMagick developers would have to judge if it is a real fix.
The workaround is to specify explicitly the option
-alpha off
on the commandline for convert. For example
convert -alpha off +antialias -density 120 -rotate 270 test.eps test.png
The "fix" is to modify the file delegates.xml and to change the DEVICE option for the ps:alpha type from pngalpha to pnmraw. The behaviour then seems to be "as it used to" again. It is unclear if this has further side effects.